/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.pvm.runtime;

import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.pvm.process.ScopeImpl;
import org.activiti.engine.impl.pvm.process.TransitionImpl;

/**
 * @author Tom Baeyens
 */
public class AtomicOperationTransitionNotifyListenerStart extends AbstractEventAtomicOperation {

    @Override
    protected ScopeImpl getScope(InterpretableExecution execution) {
        return (ScopeImpl) execution.getActivity();
    }

    @Override
    protected String getEventName() {
        return org.activiti.engine.impl.pvm.PvmEvent.EVENTNAME_START;
    }

    @Override
    protected void eventNotificationsCompleted(InterpretableExecution execution) {
        TransitionImpl transition = execution.getTransition();
        ActivityImpl destination = null;
        if (transition == null) { // this is null after async cont. -> transition is not stored in execution
            destination = (ActivityImpl) execution.getActivity();
        } else {
            destination = transition.getDestination();
        }
        ActivityImpl activity = (ActivityImpl) execution.getActivity();
        if (activity != destination) {
            ActivityImpl nextScope = AtomicOperationTransitionNotifyListenerTake.findNextScope(activity, destination);
            execution.setActivity(nextScope);
            execution.performOperation(TRANSITION_CREATE_SCOPE);
        } else {
            execution.setTransition(null);
            execution.setActivity(destination);
            execution.performOperation(ACTIVITY_EXECUTE);
        }
    }
}
